Use FFT (Fast Fourier Transform) data signal processing method for the detection and characterization of oil & gas pipeline’s alternating voltage stray current interference. The results showed that this method is capable of distinguishing power frequency AC (alternating current) stray current interference from the dynamic DC (direct current) stray current of the pipeline. It can easily pick-up the DC part and AC part of specified frequency. The experiments carried out in laboratory and field showed that the result gained by FFT method is the same as that by conventional instruments, which is designed of analog filter circuit. And the carbon steel work electrodes under natural corrosion showed its potential change toward more active direction after the AC voltage is added on. All the above showed that the FFT method is an ideal tool for the detection and characterization of the buried pipeline’s AC stray current.

Subject
Voltage, Pipelines, Installation, Free corrosion potential, Experimental data, Corrosion data, Stray current, AC interference, Polarization, Electrodes, Electrode potential, Sampling, Oil
Keywords:
AC interference, fast Fourier transformation, data signal processing, pipeline, cathodic protection
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2011
Association for Materials Protection and Performance (AMPP)
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